The company revealed Thursday that it will delay publication of the Android 3.0 (Honeycomb) source code for the foreseeable future - possibly for months. It's not clear when (or if) the source code will be made available. The decision puts Android on a path towards a "draconian future" of its own, in which it is controlled by a single vendor - Google. The Ars link linked above is a pretty inflammatory editorial, so see also: Businessweek, GigaOM, The Register.

This plays both ways. The community haven't taken care of integrating google's changes in mainline either.

If the danger of marginalising mainstream linux is real somebody should step in and do that with google consent or not. Especially if google changes carry some added value that could benefit other mobile linux incarnations.

Correct me if I'm wrong but actually the worst case scenario is that android's linux fork carries changes that relate to Google owned patents. If these became part of the kernel/user space api, google would efectively bypass built in GPL2 protections and steal linux. Google could easily use that to fight off RIM for example.
AFAIK GPL3 is designed to prevent such a scenario.